Suction filters support the closing of the check valve by using a spring. Types 572/551 also use an additional hot gas connection. suction filters are provided with bypass and test connections according to the customer’s requirements. They are fitted with a check valve and a replaceable strainer insert made of rustproof metal mesh. The check valve is attached to the bottom of the suction filter casing by means of hexagonal nuts and is maintenance-free. The strainer is self-centering and is held in the bottom of the casing. The cold gas refrigerant flows through the strainer from inside to outside. As soon as the flow of the medium slows down and comes to a standstill, the check valve closes. This prevents the screw-type compressor from reversing and thus no oil is lost. The flow of the refrigerant to the compressor can be stopped by the stop valve.

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Modified atmosphere packaging (MAP) is an innovative way of packaging perishable food, which extends the product’s shelf life. MAP is used to package meat, poultry, fish, salads, whole and cut vegetables and fruits, as well as processed and convenience foods, bakery products and dairy. To improve quality control and reduce waste GEA has developed OxyCheck as a unique, non-invasive system that checks the oxygen content and seal integrity of every single MAP product on the packaging line.